ST. LOUIS (AP) - Minnesota Vikings defensive end Brian Robison injured his right shoulder in the first quarter against the St. Louis Rams and left the field for medical tests. The team said his return was questionable.

Robison has 7 1/2 sacks after dropping Sam Bradford for an 8-yard loss on the Rams opening possession.

It was not clear how Robison was hurt during a 15-yard carry by Steven Jackson. He left the field favoring his right side and was replaced by Everson Griffen, who has played in every game with no starts.

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